"A number of mines in china, Bolivia, England, and other countries contain both tin-oxide and wolframite. Owing to the fact that the specific gravity of tin-oxide and wolframite is so nearly the same, considerable difficulty is experienced in making a gravity separation, and all attempts to do so by wet or dry concentration have given very poor results. The perfection of magnetic separators has done much to mitigate this difficulty, so that now complex ores of this nature can be treated in a satisfactory manner. The mixed concentrate from the tables or other concentrators, after being roasted to expel sulfur and arsenic if they are present, is sent to a magnetic separator, where the iron is first removed by a weak magnet, and afterward the wolframite is removed by a stronger magnet. the point that has caused trouble in this system of treatment is that the wolframite concentrate contains a good deal of cassiterite, which adheres to the wolframite or is cemented to it with iron oxide. A search of the literature has revealed that at the present time there is no complete and satisfactory mechanical method to separate tin-oxide from wolframite. The purpose of this research, which was suggested by the National Reconditioning Company, was to investigate the characteristics of the "tinny-wolfram" paticles [sic] and to try to find a method of separation which would give better results and be less expensive than the chemical methods now used"--Introduction, page 1.
Schlechten, Albert Wilbur
Materials Science and Engineering
M.S. in Metallurgical Engineering
Missouri School of Mines and Metallurgy
iv, 40 pages
© 1948 Chih Wen Ying, All rights reserved.
Thesis - Open Access
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Ying, Chih-Wen, "A study of the separation of wolframite from tin-oxide" (1948). Masters Theses. 6753.